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Pauli blocking dynamics in optically excited quantum dots: A picosecond excitation-correlation spectroscopic study

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Title Pauli blocking dynamics in optically excited quantum dots: A picosecond excitation-correlation spectroscopic study
 
Creator MONDAL, R
BANSAL, B
MANDAL, A
CHAKRABARTI, S
PAL, B
 
Subject TIME-RESOLVED PHOTOLUMINESCENCE
ELECTRON RELAXATION
CARRIER RELAXATION
GALLIUM-ARSENIDE
STATES
GAAS
ABSORPTION
LUMINESCENCE
CAPTURE
WELLS
 
Description State-filling dynamics in self-assembled InAs/GaAs quantum dots (QDs) is studied through their steady-state photoluminescence (PL) using a variant of picosecond excitation-correlation (EC) spectroscopy. Steady-state PL showed an interesting transition from bimolecular recombination at low-excitation fluence to excitonic recombination at higher fluence. As for the EC signal, while the ground-state response is always snubbed when the two excitation pulses are temporally nearly coincident, the excited-state response can either be enhanced or reduced, depending on the excitation fluence. The time evolution of this response is studied for the first three levels in a QD ensemble. A minimal theoretical model, which combines carrier loss kinetics with the principle of detailed balance and the Pauli exclusion principle, quantitatively reproduces the observations. DOI:10.1103/PhysRevB.87.115317
 
Publisher AMER PHYSICAL SOC
 
Date 2014-10-15T15:25:25Z
2014-10-15T15:25:25Z
2013
 
Type Article
 
Identifier PHYSICAL REVIEW B, 87(11)
http://dx.doi.org/10.1103/PhysRevB.87.115317
http://dspace.library.iitb.ac.in/jspui/handle/100/15147
 
Language en